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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff1d7801f0ef2c5769322b2be78952a79406c0806a0e9b1fd8b80ab9e9cd9fcf' 
  AND token = 'YSjDK3L24JI/wsJ0ol/CE9tYOHssQmbsnGiLmDWtkBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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