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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e94868c4e9689551f4d5c016b6f9132c944d603fad85e55e9c9cfa6d70838cf' 
  AND token = 'cVfOMCuAref9W0v7SA94cVoLRUUv7xyrKXcVckFqnKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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