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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fadb0b9a5736ef989362b89038b96b7a84a3b6539118d153c1eba729e7fa89c8' 
  AND token = 'tdqAsyb4ydHrYLW8OHHEfo1CQp4nALqSUXTPaduCaIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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