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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87995d1579729959208fcecc8c0bfce804c797efa129c668124227a830de177' 
  AND token = 'NdRauSDYRO+7g6EfRHh74A9TYZRDHP3xW0PsBpvFfOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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