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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb44964b068e48876c523a34a2b9a1fc522450d3fd11610650a578356cbfdc1' 
  AND token = 'Xh8dr5BPzPcRy6s+FvKAPB68/gDWVEee3d6bxinc3sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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