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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6383381012188de0bab567e26a70126ddc74cfbca7dbabf09ff77c2b01b9a409' 
  AND token = '8fRx3iyWfXC1qdPdiZpWaDMWbXFz+bzNWVLHeyD/YCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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