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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7600d2b6d497998c46efa44af78916ee3a4ade183ab8b656fb72f6207501f8' 
  AND token = 'AvQyYC4QlK244I6jTS94Ra9B02/ocRfJWIUOqu3++2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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