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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c6a674c76620543a3adc1c241111ad9b3759a5a88e957a24743bbacfeb950b' 
  AND token = 'k8dcPOGq+iZXdVwU9UXBcMlh5gPBUFxXFA05Qr9EA1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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