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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '618990e5e76370928335802e58ebdaae240a3fc067e86f86c232b6f07ea57b21' 
  AND token = 'Dp0WjQYMTE0AeJpEDuNG0h2ExvRvhs0BUyGnQcedhb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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