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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4790ff09914dcd4990d36ea13a926c58774b8c1203c2717d14b83e3b4c30c7f' 
  AND token = 'c89xLN9QSwFi6CU7gW9TySpGxXW3YlZUMiSN7ZuP4o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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