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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa93672b6e7145d8b2c2ee4d67750b94ce15d122b71ceaf2fcdca055d848f5a4' 
  AND token = 'Pj1chbwtAQlWCwWBci6f2RCEPZXIOaB4xDatjrnYJBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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