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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12bab0ea9c05469e00a27832a16b8d09cf0f6f8a9aea5ea01b3af157884911f' 
  AND token = 'bju8li7BSzanobnqmR7hY75MAV08jL1hUhcYYQ8FxBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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