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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e18730015ac2908a3713630668f5fc981dd002b165c8b280d7e7a854a31652' 
  AND token = '0lTgWDrog2Zy+IjzY2X1Wi1KyAKZrxjujvCpcqKYw5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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