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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3cbcd033786469996d8eaf9342395e322ed513100f1b8fa907ab7ae078d0c9' 
  AND token = 'WxXBr5liA8Vqp1aN2HVdRU+F//g4qV1QWLfG+dAa4Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00200

JSON explain

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