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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd4858c24eb3ffdc424c411660515c62ccc9c2275cf7d242f113ed8e3d360f6' 
  AND token = 'tqdGduKTRYME7rLncrXyf+FSLYAed0kS/8r7ZVny8JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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