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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7c330b34dfc9bf78d05e9a919ee6b9a7ea817a68281613f93acc60e39ff451' 
  AND token = 'dQoWpJ/u3+CxOS1roO5te/rm7EEpTBdWd7qJlivdoUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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