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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '419fb8941e0970b8f59a65836aaff8b5d51b78c7932200abb5265097a580ce13' 
  AND token = 'T0cHlqd9FZ5ZAp3ZaV01DJBxmZz9Epa7ikrDv343SKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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