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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd0f3e0300819fe85c23a58fd9959e1623a2be9435df5223796a31b1faa7b99' 
  AND token = 'xI7U8a6lfQZoXcVVjVarYDAQ3pmUyItX40iiMxeb/rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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