SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16627a183147dc14a9162d960467d6367bba227c95557217838b59a98f229741' 
  AND token = 'O3+7Xu/A4/+hQcWfMFLbc9JiWSviZ3SoTPM5DGBq6jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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