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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2bff19b7cce4c0847bffe4eef601032f5af631bd83d066fead8932a4e76681' 
  AND token = 'O/WWTXo+ri+ODa3NVfOG2EQ5oCBlOQmCniHQr/9BuUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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