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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc739ed646715ff3aa8e31403eb9cac8e42e6b756c58d34354885ae6a92582d' 
  AND token = 'HheywwDLxmrQ3Js2waRGivhvsocG0q7Z7opUfnQBwRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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