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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc56629d43abd6439eca59cb3fde6a9d3bb172333f8f8dbd4883d3d7fc253ec' 
  AND token = '8uO9m0JAK3i0WyaeAIR6w/8oDhv5CGFM9pyM6Jlstfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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