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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403e7fd4c0bdbd8e77a1587d58ec202df7fc7d6a65455ddd023beea12cebc4f6' 
  AND token = 'C8E/gcFi9QWTpt1TPT9SDG6qVenxRCakPZdT6wOtotA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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