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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd117785122afe62d54b683d58733cea9e982c08850d4c8e42d007914c9ce1073' 
  AND token = 'B8Tcm14riN4xZYLzO7TQqKNfP7yZwQwnPUAcbOV/PQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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