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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc0e78709a4739611e246851260c469a007f0792c80be6790228babceb1f660' 
  AND token = '5m/oZmtsBq6QUnlavFFiI0SNtEE2H/10sAv7/9Ucny0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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