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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe17e805d643010ed87975af8e4fdbdda31497796d02111048e03ae1eb3493b' 
  AND token = 'KA3X3p9cf8EFRzRds0SiU/F9BQBN5MXOGXCrQUk1WaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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