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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a484d9f784e9b77de40fade1f10dde1578c3c71287331b95150b77d2116783d2' 
  AND token = '+GHQ38cneCjFqrv/fCNWd9HXepkzSSna7IV/OfSPRUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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