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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c26d159f44d6eda0d70299ca6e73a49412cc648f0e8a56f13a5676cbcb1269' 
  AND token = '3a5VYDXk65Rki1xnkXO1WaWfxs3svTPn8gBANyUcy1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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