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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93353a4385660def233d9e216b9fb9d59b83549313738fa437e12b683573ea3' 
  AND token = 'e8fJ453wC4iEHlzzqFIAw7xpT7yp3uOYuoCagUTta54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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