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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce8cb11636388d775141430de34411f4f9ff745b6a55d890a3a37402e732fb3' 
  AND token = '/Gk+e2MZvY4gguZxLo2/FLfM5W5RJKpLtSubEv5y3ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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