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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf6680d0bce6eb1cfcbe60ac21c3bece54bdc5fd44242190171d1b6b7cd0fb0' 
  AND token = 'hDqmJHZqYzMZmUNaj6Uiwvc8B5T5TX+oS1wuwSscxeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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