SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8fbe0478b992ff28a407007dc15af56b341ec386e43f77c36489aad62b3249' 
  AND token = '7duz+lKLSF3JIlkcaYKFLOqNPoGwwIMetrlyj/BwMCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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