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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6536656d2b28d914927548731acb2bc3df36f5183557eaaeace7eb7306a7e136' 
  AND token = '1fZ5MWms8zOgz6drOuqYadDNILQD98h16Pi7XWtr4Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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