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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa1a9eaee5ae59407e96d158944c02d8ce5d632f263907d311e120e79adb58d' 
  AND token = 'gOcyKiA2IR4FTvbQ0Ekqw3t3H3Ej1N6Wm7ThnaLu+TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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