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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07aeac8e2841329265fd490280cd147a1bdb8c72a801a9b5daa91ccbc159f39f' 
  AND token = 'vnPmbMP98fRpiufv1dBeebKqRlfOyk3fJqk+SoKbDDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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