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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98248dc7eba6bf2f8b205f768a6e6bdaa33e1665f835a3f86ebaa0122968ef5' 
  AND token = 'f1LmEAbmcBfYi/V9FeiTCMeU5x89zcqrn84MsUEjlc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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