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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8231e70bda23361d160cc303e1f54de9f09a9bd73b74cfc7ac89505c6d39e0c9' 
  AND token = 'caKm33GB2GyzrtXXjX8MBf+PXZoVc6ElLu6VJPCKieE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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