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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e830031da3ffec956666bfab73ac5fca59e61a2c2821aefd8c8b2c53140ef877' 
  AND token = '79NZyYNQ0sioy7zyrhkJVq9EdKonYcAJa3MHpwMhiQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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