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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd493c60a31fe98992e91828a6cc42dad4dae31ab43a2009d4b63084ee1a2f1' 
  AND token = 'z74JSV20efVo1fC9w8oC6LohQbP1VsVSh+8BScuNHzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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