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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec340da396d23c2f8b081655a7a72998fa8e55d0f57a60e9db3ac1d41c8badd9' 
  AND token = '0ZeNe+7j18WzF9T/TCkNyInlQLqc0XgSOPi8aQQvNXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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