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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6bae45fd5de1d2c56c47a4dd98be8d713bb0303c8a1d0a92a3548e34c9c9c3d' 
  AND token = 'cop7PpVr5FJx9MK3f7EjxigUa4cd4SkhkA/9EzmMA9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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