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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae201efa12eba15883f575734f5adfced5a87ff08e1cc4444486ab15656ba04d' 
  AND token = '3kqRFSK+ihiQwWvZzF9xOIjf7P49U3ysuWzSmIrB0Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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