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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a365c09c587b5c41fed89546326ff5f61e96e92ba3f10ece154dc6d294850f' 
  AND token = 'TXFukZ1ziBWTUK9ijLUyeKZTWgQV7PyiHb0s7IPlNyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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