SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c725d33d4e313fd9689867da01feabea6182d4dcdd3b40a956f40b29366bd1' 
  AND token = 'qz/mwhSRhPcUPTUJcG+32TWlf96VCk4+SR6f1kuxjps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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