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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '340f63c4720b33ea4c47bd4c69dbf1256ba6fc3f49dfc097a0c87d432d396799' 
  AND token = 's0F4HhDiqBeI5mdkA6kDw2DpBA2jyoFvQLY2DhqzsNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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