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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e3bf4a6e32e580ab8e59629aa194ad7b02929587b6340689600570d85c8175' 
  AND token = 'ot3UOHpk98JQbMqK6wWmKtzIerfpnK4cxQQQa14gd8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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