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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '535b89e08c4ad1d292c42b359b28bbc4cf77abed9c30b6f4797cc276aa75da05' 
  AND token = 'g53BKmtYhx9gYprcb4WsJds+5ipULGdasAUdUzYdzqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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