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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11b83b377eacddc0492402391d4b0b4f234987afee88a64840f9273f97248745' 
  AND token = '/Fk0J0M9aZb0FWe8rIr2jmChbon8iwvUXd9KWEQYJQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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