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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b3416e963117a849a835902e8ce64139ffee232ec169e3cfe65ebd9fbf2cce' 
  AND token = '9KZOot2Ody1+uC4dMsAHMma6VrJbeY6kf+mUjkgDpx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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