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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f5494d88d2781a62120db76a9dfce53abfb75d0d7232f24a3a5628aa1c6c107' 
  AND token = 'em+bohSRC0DdVt1FHpSmT/VmH8TwGY0GtksWmwV4lQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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