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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3999de564ea6bd7593ff289b1b2eb517cb308728e4f86137cdca87686aece7f5' 
  AND token = 'N8PgWLz3wh15VMYjfudIrxRZeZXrOGW5bG3FpeEjnDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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