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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f11e75676a6e317f96b6ab0999ece816b574b8d7176d0557986792e1d7e40ff' 
  AND token = 'szgybXNfJnBkIPIX9wiWkzEG9EpJKfJERQciL3fj70g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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