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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08148ddcab4f4f0a04c64df66f9d6dc685f89cee3f230173ca5d9b79fecdb5aa' 
  AND token = 'wD4OdOYgdMGUO3nNIHs0Nm2T3rYWBHGC3AkkZksdSls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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