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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ec998bf2d93a5a65e149c41f6ac2c3bd821c4e4ff8cda03a71580409132e88' 
  AND token = 'uXeFhcO8+E4R162oGFxz6ni+NX+7PB6ZoNdxBBrRaTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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