SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a964073a80a5d38b3229467883a5e2fb1202ffb4d5f34e0a530e9bbfc7253e3' 
  AND token = 'D2V+HDcDXcH5iIDhRzbA/xwQBSvuZNXNBn7d+eY61mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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