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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '891a18dc369690a5f5fc3b862fb08debdc92dc43011ba2a6a7b1bd435ecf661c' 
  AND token = 'bUIFs4q4xZUYKaBSnhN/Uiy7DjnEwKl9udS/O67Kqrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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