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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d3cbc200925384b76f28c3054771080c493b98ffca11f7633954aa5e1e6076' 
  AND token = 'DWSaGIylAbkRcZtFkVf3Iixs+SZWILyAX8HcNAbyPu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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