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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e039d93cb58a5b45f1129546cd2688329b183189e17caccc55b052ee8f943209' 
  AND token = 'RWMbvrYpvXe4McxGP6XqjgYsWg3o6glY1Qvjx0Hh4kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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