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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944b812e2dc50ebed4f5e5d46f75e1ba675e90d3b845fa27d11318c2decb21b1' 
  AND token = 'HkPp6ysmOjflDsmrBT234T5Ah28DzlWwuG5D9eGIeZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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