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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '159f9a39cac282ec145cb8a576b4cf86f01f92acda6d18fd7b854c2a90a60574' 
  AND token = 'ttj53OMDqLytQaA2Xu5CMTWjWmvkmC0L/frc5VXHLqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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