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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42b1174ef4ea0818294578bebe31c8d587bda7314215719f588b736cacbd266' 
  AND token = 'azhinzRw4Y/rM1QcOJB+f3nIGDc0fpQud3bNwnr/yuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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