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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c57aae9f6c2c6982a00e171000259d4d812129c3b8c6bbd954fb5a2e0aa37e' 
  AND token = '6Z9gd95MT4FtfVE2YmggSFZli6h9BIZW/ww+T8QCa0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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