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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b87d246b692814be912e7f30b287509a79b1643119e388ee863edad7d8590c' 
  AND token = 'HcMS7SEwchuiwnURVqvfNf36hhhN+HA3MNoRJU76Yio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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