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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f52a6c89010d7e6c608033fec7021d818e4c7caebd8e22521447b966676ab5' 
  AND token = '2p9v98+cH3ncBc5rXLlnMoABBwgoaT01faf3HO9jxVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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