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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62be014140f5f0bd228bec7238f3f636851831a005bc7381783bac631b0622d' 
  AND token = 'vejknWgLwV7j0hKqBGlAiEACUSXhrfo2MS7eoZI7grw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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