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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c461186e2a847f5ed94eb855966f96d085915a9851ad3350af8be48cad84c3c9' 
  AND token = 'YTVahaVoASvEdef7J9p2EJeH5ddN6LhbfyrDqSad++c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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