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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da670a9953cc2f5d81fca31f647e93580ace96982ce5f9503cf99e7bad2c568b' 
  AND token = 'dzMbodk+CLFHi4xC5zOTCeOwDH1H8CkD54LyWk9vlDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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