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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd07fe217f87d2b53463d0d67594863476b40669b2b04b17f48e6bb27fd273c65' 
  AND token = 'YbQY9SLcdm/rxY8mnPgYKEVumch9IyDXme+QbWewpD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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