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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873b63a14117f234e9a871a5bf12cebc5cb9fe768aff7f779c8b428a588f16b5' 
  AND token = '03kfy4zY9UGtgve+xY2jLQpoJkB8xipRFbY3NqSo8Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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