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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a5c2ac49cee4642f02def6b12758002f1a0ee2e0dd9b30b2e4c2cd1167e6bad' 
  AND token = 'VAGBiePQtGWBLZnCh2WoM/nxHl+WH8ZLZ7DXQn4HuME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

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