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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '047ce1362de28ebb92c2e5f29073caf6535602f17f7250a5ee5727344cc9ef09' 
  AND token = 'aN55fM2GUlfDJ07obKW6j8LgDwOOPlGik4pFzYdhXxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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