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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3ac67616f28ba3a6a346daa324f04f1271107e564506416ab175c44a46a4a2' 
  AND token = 'VEpk+m6tkQ0RcPCeXMTgUTfCI+HGTDMMp10cBg8t/Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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