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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f63988ba18a0f38bf9be2f79507dd7d32c228f48e4fd97355492213f4f44e88f' 
  AND token = 'yKQqINZSu3Hhrwm5eXo5ctHGZQNaPEZZy0zw0CBTgG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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