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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55caca4f86018411bb762681e3b5e4e74a8802ed9e797bea0af7e4b1b8c695f' 
  AND token = 'EJOUUyyxyLKO8nwzBPVDKsgKSruqKTVAQ3e7w9tfSJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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