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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b4d9322f4a7a21d31705929ad326dd7231baba1d917abcf0db93d469e8a8e9f' 
  AND token = 'Q81RTDCAAOhJKefvzi94ACsWKkQx8qO6YNp75YBEj2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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