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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9db9d7eda52a1cf5395357217780bd8c62d6d1c7a7bfa827448cbf5c7c68f4e' 
  AND token = 'B9lJf9BtJZCca975I6oG7G6cY6TilybUCStAL1x3ZxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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