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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5b95eb5eb612df850b774f80e69940904e3cf4251eb1a6d1346cee707cd96d' 
  AND token = 'ZbP2L/4VYG15ZH5CYQsb7CZmR+m9THv4qCN5wup2+eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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