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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14b88a6c7d65812d24d0cbfb6c8496125e61618fec0810bfdc2d29a7c23cac1' 
  AND token = '2Yi4qb5NpcsrCMD2X3lNh2yH69xRlMGByDV64Ah7jBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}